Researched
Mechanical Refrigeration
Jacob Perkins patents the vapour-compression machine in 1834; refrigerated stores, ships and railcars follow.
Open in the interactive tree →A fluid that is compressed, cooled and let expand removes heat from a cold space. The same cycle drives refrigerators, air conditioners and, run in the other direction, heat pumps. Carl von Linde's ammonia refrigeration machine (1876) opened the cold chain for meat, dairy and fruit across continents.
Prerequisites
- Thermodynamics1824
Unlocks
- Air Conditioning1902
- Quick-Frozen Food1924
- Heat Pumps Scale Up2022–2026A heat pump is a refrigeration cycle run for heating